This image made from video shows the scene following a bomb attack on a van carrying U.N. employees in Garowe, in the semiautonomous Puntland region of northern Somalia Monday, April 20, 2015. A bomb exploded Monday in northern Somalia, killing at least 10 people and wounding many others, police and U.N. officials said, with the al-Qaida-linked al-Shabab group claiming responsibility for the attack, according to the group's Andalus radio. (AP Photo)

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By Abdi Guled, The Associated Press

MOGADISHU, Somalia - A bomb exploded Monday on a van carrying U.N. employees in northern Somalia, killing at least seven people and wounding several others, police and U.N. officials said. Al-Shabab claimed responsibility for the attack.

UNICEF said in a statement that four of its employees were reportedly killed in the bombing of their van, which was painted white and had UN painted on the side in blue letters. Four others were seriously injured, the U.N. children's agency said.

Both foreigners and Somalis were casualties of the attack in Garowe, the capital of the semiautonomous Puntland region, Col. Ali Salad, a senior police officer in Puntland, told The Associated Press by phone. He said 10 people had died though Garowe Police Chief Col. Ahmed Abdullahi Samatar said seven died.

A U.N. employee in Garowe, who insisted upon anonymity because she was not authorized to speak to the press, said most of the victims are foreigners working with the U.N.

The U.N. representative to Somalia, Nicholas Kay, said in a Twitter post that he is "shocked and appalled by loss of life."

The bomb was apparently planted under a seat and was detonated by remote control, said police official Yusuf Ali.

Garowe resident Jama Hashi said he heard a thundering blast inside the van, which he said was passing near the offices of the U.N.'s food agency when the bomb went off. Human limbs were scattered around the scene, he said. Security forces sealed off the area as ambulances carried the wounded away.

"It's a dark day, but terrorists must know that the blood they shed will not go in vain. We shall deal with them with an iron hand," Salad said.

Bomb attacks are not common in northern Somalia, unlike in the south where al-Shabab Islamic extremists are fighting the Somali government and the African Union forces bolstering it.